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https://issues.apache.org/jira/browse/SPARK-58315?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yan Yan updated SPARK-58315:
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Summary: Improve DSv2 scan statistics handling (was: Improve DSv2 scan
statistics: compute on demand and keep them accurate after pushdown)
> Improve DSv2 scan statistics handling
> -------------------------------------
>
> Key: SPARK-58315
> URL: https://issues.apache.org/jira/browse/SPARK-58315
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 4.3.0
> Reporter: Yan Yan
> Priority: Minor
>
> The DSv2 scan statistics path lags the v1 (toPlanStats) path:
> 1. computeStats always fetches full statistics, even when Spark only needs
> sizeInBytes (CBO/plan stats off). No cheap size-only option for connectors.
> 2. After a filter is fully pushed down, the source may still report
> whole-table
> stats. Spark can't tell, so it plans on the too-large, pre-filter
> estimates.
> 3. Statistics from a v1 scan are silently dropped: V1ScanWrapper doesn't
> implement SupportsReportStatistics, so computeStats never sees them.
> 4. When only a row count is reported, Spark uses the default (huge) size
> instead
> of deriving one from the row count.
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